enum PerTimeInterval

Time interval used to monitor a MeaurementType value against a threshold.

Specifies, for Threshold Monitoring of a Cumulative Counter, what to compare against the threshold.

References from:: MeasurementReader;

`0`	`PER_SECOND` Rate of variation per second of the measurement type value shall be monitored. What shall be compared against the threshold is the rate of variation per second of the measurement type over the monitor granularity period.
`1`	`PER_GP` Absolute value of the measurement type shall be monitored. What shall be compared against the threshold is the absolute value of the measurement type at the end of the monitor granularity period.